Guayaki Yerba Mate (can) vs Diet Coke: which has more caffeine?

Guayaki Yerba Mate (can) has more caffeine than Diet Coke on both counts: 150mg per 15.5 oz can against 46mg per 12 oz can, and about 10mg per fluid ounce against 4. The serving sizes differ, so the table below shows both ways of counting.

These are different categories of drink, which changes how the caffeine arrives. Energy drinks and sodas list an exact number because caffeine is a measured additive; brewed drinks vary with the beans and the brew, so their figures are compiled averages. The numbers here are the standard published values for each.

Guayaki Yerba Mate (can) vs Diet Coke: the numbers

Sources: Guayaki Yerba Mate (can)'s figure is verified in our Guayaki Yerba Mate (can) caffeine guide against Guayaki product page (source); Diet Coke's figure is verified in our Diet Coke guide against Caffeine Informer (source).

Which one should you pick?

Pick Diet Coke when you want the lighter dose or a slower ramp, and Guayaki Yerba Mate (can) when you actually need the bigger hit and know your tolerance. If you are stacking either with other caffeinated drinks through the day, run the math against the 400mg reference rather than guessing.

For context, the FDA cites 400mg of caffeine a day as an amount generally not associated with negative effects in healthy adults. Tolerance and health vary, so treat these numbers as information, not advice.

Related reading

• Guayaki Yerba Mate (can): the full caffeine guide
• Diet Coke: the full caffeine guide
• The verified caffeine database
• Every drink compared: the comparisons index
• Compare any two of 120+ drinks

FAQ

Does Guayaki Yerba Mate (can) or Diet Coke have more caffeine? Guayaki Yerba Mate (can): 150mg per 15.5 oz can versus 46mg per 12 oz can for Diet Coke.

Which is stronger per ounce? Guayaki Yerba Mate (can), at about 9.7mg per fluid ounce versus 3.8mg for Diet Coke.